We are accustomed to paying special attention to the Sacrament of Baptism, especially of infants, and this is often done to the detriment of both adult baptism and the preparation and formation to be considered before and after baptism. Therefore, in this article we want to draw attention to some formative elements that defined the life of the Church in the patristic period and that today have remained isolated, most of the time, at the level of academic research. The whole life of the Church is mystagogical par excellence, mystagogy being the Church's guiding method towards approaching and uniting with God. Catechesis and patristic mystagogical commentaries are two expressions of this way of guiding the faithful, which should be reconsidered in the Church at the level of each diocese. Only by understanding the meaning of mystagogy in the Church can we rediscover catechesis as the living word, springing from the experience of the Holy Spirit, which has renewing power in the life of every believer. On the other hand, we want to emphasize the important role that the community of believers must play in relation to any new member of the Church. Without the awareness of responsibility towards the other members of the body of Christ, one cannot build a true spiritual life.